“He is no longer a patient here, “ Hanson said. “I don’t know where he is.”

The Chicago Democrat, who is reportedly under federal investigation for alleged misuse of campaign funds, has been on a leave of absence from Congress since June. He won re-election a week ago, issuing a statement of thanks from Mayo.

Members of the House of Representatives are scheduled to return today to Washington for votes scheduled for 5:30 p.m. Chicago time. It is unclear whether Jackson plans to participate.